will it fit?
I learned a lesson on my first build.
I had ordered the motor and then "perfect bike" showed up on my local Craig's List for $120. I took off from work and went out and bought it. Two days later, my engine kit showed up----DOH! Motor won't fit under the crossbar.
As it turns out, though, I used the high quality wheels and great seat off of the craig's lister, bought a chinese cruiser from my local K-mart for $100 I took my motor to the store when I got the new bike to make sure it fits. I put the cheap wheels and seat on the original bike which I sold the next day to a neighbor for $80. Still a really cool frame and the lighter duty wheels and seat serve just fine.
Now I carry around a full scale drawing of the motor (make sure you consider clearance for both the carb/air filter AND the exhaust) when I am somewhere that I might pick up a likely bike so I can quickly check.
Did I mention I'm hooked after my first one? This weekend I'll start work on motorizing a 1937 Cleveland Welding Corp All American I picked up at a local flea market two weeks ago.